You have set the settings for all users in the Default Settings for Users - Purchase Requisition in your Q system and now you want to migrate the same values to your P system.
SAP S/4HANA Cloud
In the Default Settings for Users - Purchase Requisitions app you have the option "Excel-Based Data Exchange", with this option you can download a Excel file with all the user data from your Q system and use the "Upload Excel file" option in your P system to upload all the Default Settings for user.
KBA , MM-FIO-PUR-REQ-SSP , Fiori UI for Self Service Procurement , Problem
SAP S/4HANA Cloud all versions